1 Pair x 300mm Polyfix Polyplastic Tube Stay with Lever lock, set of 2 with 'slide-on' Polyfix design. These 12mm diameter aluminium tube stay arms are specifically designed to fit the recent variant of Polyplastic windows, which are fitted to many caravans and motorhomes.

The slide-on 'Polyfix' design are easily recognisable by the deep groove moulded into the back of the window fitting. It is this that slides over the adaptor fitted to the window.

Slide-on fitting
Supplied as packed pairs
 
NB Some companies refer to these as 280mm - they are the same.